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Brownian Motion

Pass the toilet paper to the Scientist in need.
Upplåst 6 jan, 2021 @ 7:58

Caffeine Extraction

Perform surgical caffeine extraction from 20 vending machines.
Upplåst 6 jan, 2021 @ 8:17

Calculated Trajectory

Kill 10 airborne Headcrabs using the Shotgun.
Upplåst 6 jan, 2021 @ 10:08

Centripetal Attraction

Kill 20 Enemies with the Hivehand.
Upplåst 7 jan, 2021 @ 8:45

Convection Refinement

Ruin the microwave casserole.
Upplåst 6 jan, 2021 @ 7:56

Dead Reckoning

Kill an Assassin with the .357 Magnum.
Upplåst 6 jan, 2021 @ 13:22

Digital Wizardry

Kill 10 enemies with a reprogrammed Sentry.
Upplåst 6 jan, 2021 @ 9:54

Ethically Questionable

Conduct all of the questionable research experiments.
Upplåst 6 jan, 2021 @ 15:50

Futile Resistance

Kill 10 Enemies with Snarks.
Upplåst 7 jan, 2021 @ 9:33

Gray Matter Propulsion

Headshot 20 Enemies with the .357 Magnum.
Upplåst 6 jan, 2021 @ 12:19

Hyper Saturation Conundrum

Drown in Lambda Core's coolant.
Upplåst 7 jan, 2021 @ 10:00

Inflammatory Actions

Kill a Headcrab using fire.
Upplåst 6 jan, 2021 @ 8:21

Kinetic Repulsion

Kill a Marine with their own Grenade.
Upplåst 6 jan, 2021 @ 11:43

Mega Hertz

Kill 5 Enemies with one Grenade.
Upplåst 7 jan, 2021 @ 12:49

Nuclear Fishin'

Kill an Ichthyosaur with either the Tau or Gluon.
Upplåst 7 jan, 2021 @ 7:05

Permeable Infrastructure

Use the alternate path in Office Complex.
Upplåst 7 jan, 2021 @ 14:53

Premature Expulsion

Use an entire clip of Gluon ammo in one continuous shot.
Upplåst 7 jan, 2021 @ 9:57

Prophylactic Suggested

Get overtaken by a Headcrab's ample anterior.
Upplåst 6 jan, 2021 @ 8:46

Proverbial Tinkerer

Interfere with the alarm and laptop in Anomalous Materials.
Upplåst 7 jan, 2021 @ 14:46

Quantum Capacitance

Overcharge it anyway.
Upplåst 6 jan, 2021 @ 15:13

Rare Specimen

Send the Hidden Hat to Xen.
Upplåst 9 jan, 2021 @ 20:09

Remote Detonation

Kill a Barnacle with a Satchel.
Upplåst 6 jan, 2021 @ 10:38

Resonance Procrastinator

Refuse to insert the specimen into the Anti-Mass Spectrometer.
Upplåst 6 jan, 2021 @ 16:02

Unified Coupling Theorum

Help the Barnacle and Headcrab find true love.
Upplåst 6 jan, 2021 @ 10:06

Universal Gravitation

Get killed by your own Snarks.
Upplåst 6 jan, 2021 @ 15:07

Prolific Popper

Kill all Protozoans in the Borderworld.
Upplåst 7 jan, 2021 @ 18:59

PhD in Pacifism

Don't kill any Vortigaunts in the Borderworld.
Upplåst 7 jan, 2021 @ 18:48

The Rarest Specimen

Carry the Hidden Hat to Endgame.
Upplåst 10 jan, 2021 @ 11:32

One Step Ahead

Kill 10 Enemies with Tripmines​​.
Upplåst 6 jan, 2021 @ 11:48

Stealth Technology

Escape the Hangar in Surface Tension without alerting the Soldiers.
Upplåst 7 jan, 2021 @ 9:23

xen when

Wait too long to jump into the Lambda Teleporter.
Upplåst 7 jan, 2021 @ 10:46

Our Brains And Your Brawn

Assemble all the possible Scientists and Guards at the end of Office Complex.
Upplåst 7 jan, 2021 @ 20:19

Less Than Desirable Consequences

Die in the AMS Beam before starting the experiment.
Upplåst 6 jan, 2021 @ 16:03

Orbital Trajectory

Skip the opening Xen island with a secret jump.​
Upplåst 7 jan, 2021 @ 10:53

Following the Rules

Use the welcome mat.
Upplåst 7 jan, 2021 @ 11:04

Doctor’s Signature

Deliver the finishing blow to Gonarch with your Crowbar.
Upplåst 7 jan, 2021 @ 14:36

Gonad Glider

Get whacked into oblivion in the ledge fight.
Upplåst 7 jan, 2021 @ 15:07

Post-Mortem Interval

Find each member of the missing research teams.
Upplåst 7 jan, 2021 @ 20:58

The Plan

Use Cyanogen to kill Gonarch.
Upplåst 7 jan, 2021 @ 14:25

Unquestionably Ethical

Don't use the Cyanogen and let the Gonarch live.
Upplåst 7 jan, 2021 @ 14:34

Contest Propellant

Find the snack supply canister.
Upplåst 7 jan, 2021 @ 17:20

Laser Immunization

Complete Interloper without taking any laser damage.
Upplåst 7 jan, 2021 @ 18:48

Black Mesa Decathlon Winner

Escape the Gargantua’s Lair without taking any damage from Gargantuas.
Upplåst 7 jan, 2021 @ 17:38

Anti-Matter Over Mind

Kill a Controller without killing any of its mind-controlled Vortigaunt slaves.
Upplåst 7 jan, 2021 @ 17:19

Specimen GG

Take out all three Healing Crystals in Nihilanth’s Chamber at the same time​.
Upplåst 7 jan, 2021 @ 19:10

Late for Work

Defeat Nihilanth in under 4 minutes.​
Upplåst 7 jan, 2021 @ 19:25

Limitless Potential

Accept G-Man’s offer of employment.
Upplåst 7 jan, 2021 @ 19:17

Rather an Anticlimax

Decline G-Man’s offer of employment.
Upplåst 7 jan, 2021 @ 19:16

Pepperoni Precipitation

View the *other* secret ending.
Upplåst 13 jan, 2021 @ 0:51

Well-Done

Cook a Grenade for too long.
Upplåst 6 jan, 2021 @ 11:31